热疗
材料科学
纳米颗粒
磁铁矿
磁热疗
热分解
磁性纳米粒子
磁铁矿
氧化铁纳米粒子
化学工程
核磁共振
生物医学工程
复合材料
纳米技术
化学
医学
有机化学
冶金
物理
内科学
工程类
作者
Ananiya A. Demessie,Youngrong Park,Prem Singh,Abraham S. Moses,Tetiana Korzun,Fahad Y. Sabei,Hassan A. Albarqi,Leonardo Campos,Cory Wyatt,Khashayar Farsad,Pallavi Dhagat,Conroy Sun,Olena Taratula,Oleh Taratula
标识
DOI:10.1002/smtd.202200916
摘要
Due to the limited heating efficiency of available magnetic nanoparticles, it is difficult to achieve therapeutic temperatures above 44 °C in relatively inaccessible tumors during magnetic hyperthermia following systemic administration of nanoparticles at clinical dosage (≤10 mg kg-1 ). To address this, a method for the preparation of magnetic nanoparticles with ultrahigh heating capacity in the presence of an alternating magnetic field (AMF) is presented. The low nitrogen flow rate of 10 mL min-1 during the thermal decomposition reaction results in cobalt-doped nanoparticles with a magnetite (Fe3 O4 ) core and a maghemite (γ-Fe2 O3 ) shell that exhibit the highest intrinsic loss power reported to date of 47.5 nH m2 kg-1 . The heating efficiency of these nanoparticles correlates positively with increasing shell thickness, which can be controlled by the flow rate of nitrogen. Intravenous injection of nanoparticles at a low dose of 4 mg kg-1 elevates intratumoral temperatures to 50 °C in mice-bearing subcutaneous and metastatic cancer grafts during exposure to AMF. This approach can also be applied to the synthesis of other metal-doped nanoparticles with core-shell structures. Consequently, this method can potentially be used for the development of novel nanoparticles with high heating performance, further advancing systemic magnetic hyperthermia for cancer treatment.
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